Carapace about 1.4 times as broad as long, convex in the anterior half and depressed in the posterior half. Surface thickly covered with dark brown setae of various lengths, those near the margins being longer; regions well demarcated on denudation, each region covered with a patch of granules, interspersed with short setae between the regions; Front deflected, its breadth less than one-third the breadth of the carapace, and cut into 2 lobes by a median notch, each with a distinct and prominent extero-lateral angle. Orbit small, dorsal margin bearing 2 notches. Antero-lateral margin slightly shorter than the postero-lateral one, and armed with 3 teeth, excluding the outerorbital tooth: the first one triangular, the second one sharper, and the third one the sharpest. Postero-lateral margin slightly longer than the antero-lateral one, straight and more or less forming a facet.Chelipeds asymmetrical, with long setae. Merus covered with granules and short pubescence on the outer surface. Carpus sharp at the inner-distal angle. Palm devoid of hairs but bearing beaded granules in the lower half of the outer surface. Fingers black, with irregular obtuse teeth along the cutting edge. Ambulatory legs depressed and covered with long setae. Dactylus with a cuticular claw.First pleopod of the male slender and long, arched ventrally in the middle and with a hook-shaped apex. Male abdomen 7-segmented. Telson bluntly triangular. Carapace length of the male 18-25.5 mm, breadth 25.5-30.8 mm; of the female, length 18.1 mm, breadth 25 mm. (Dai & Yang, 1991)

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Gravely, F.J., 1927. Decapoda (excl. Paguridea) and Stomatopoda. In: The littoral fauna of the Krusadai Island in the Gulf of Manaar with Appendices on the Vertebrates and Plants. Bulletin of the Madras Government Museum, 1(1): 135-155, figs 1-2, pls 19-26.

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Lanchester, W.F., 1902. On the Crustacea collected during the Skeat Expedition to the Malay Peninsula, together with a note on the genus Actaeopsis. Part I. Brachyura, Stomatopoda and Macrura. Proceedings of the Zoological Society of London, 1901 (2): 534-574, pls 33-34.

Miers, E.J., 1880a. On a collection of Crustacea from the Malaysian region. Part I. Crustacea Oxyrhyncha and Cyclometopa, except Thelphusidae. The Annals and Magazine of natural History, (5) 5: 226-239, pl. 13.

Miers, E.J., 1884a. Crustacea (Brachyura). In: Report on the Zoological Collections made in the Indo-Pacific Ocean during the Voyage of H.M.S. Alert 1881-1882. Part I. The collections from Melanesia. Part II. The collections from the Western Indian Ocean. British Museum (Natural History), London, 8(1): 178-322, pls 18-32.

Takeda, M. & S. Miyake, 1968a. Pilumnid crabs of the family Xanthidae from the West Pacific. I. Twenty-three species of the genus Pilumnus, with description of four new species. OHMU, 1(1): 1-60, 13 figs, pls 1-4.

Yokoya, Y., 1933. On the Distribution of Decapod Crustaceans inhabiting the Continental Shelf around Japan, chiefly based upon the Materials collected by S.S. Sôyô-Maru, during the years 1923-1930. Journal of the College of Agriculture, Tokyo Imperial University, 12(1): 1-226, figs 1-71, tabls 1-4.